c - kill a specific thread in GDB -

i want kill specific thread in gdb. how attach program gdb.

(gdb) r ./bin/myprog arg1 arg2 

i current running threads by

(gdb) info threads     3 thread 0x7ffff61fe700 (lwp 28549)  0x000000323b6db7ad in foo () /lib64/libc.so.6   * 2 thread 0x7ffff6bff700 (lwp 28548)  bar () @ ./src/myprog.c:229     1 thread 0x7ffff7506740 (lwp 28547)  0x000000323be0822d in pthread_join () /lib64/libpthread.so.0 

this how tried kill thread (say thread 3)

(gdb)t 3 [switching thread 3 (thread 0x7ffff61fe700 (lwp 28549))]#0  foo () @ ./src/myprog.c:288 (gdb)call raise(3,0) 

here assumed signature of raise raise(threadid displayed in gdb, signo 0)

but thread not getting killed. should use different signo or thread id wrong?

note: read this question in did not me

signal handling in multithreaded apps complicated. thus, makes more sense switch thread, make sure not holding resources (such locked mutexes) , invoke pthread_exit() on behalf if exited on own accord.